Started playing.

I tried to get this game work on Linux desktop PC, but it's not working. Odd how this game worked on Steam Deck. Perhaps it's CPU or GPU related?

UPDATE: (5/24)
I found a fix for the Linux desktop PC. I had to add one launch option: PROTON_USE_WINED3D=1 %command% -vanillaGFX

🪙 Reboot mode - 1CC - Easy difficulty

I'm going after normal 1CC next both on Reboot and Retro modes.

🎆 Game beaten!
⚡ Difficulty: Easy
⏰ Time Taken: 3 hours
💀 Deaths: 83

I finally beaten the game! Never beaten it on normal, because of unbalanced difficulty and BS stage design choices. Not to mention, stage 7 takes luck at the beginning due to turrets attack whatever it wants, plus you can't bullet seal it. Like WTF.

I have yet to 1CC on easy.

🏆 15 out of 28 achievements earned

✅ Easy difficulty clear
✅ Normal difficulty clear

Unfortunately, the game does not stack difficulty specific achievements, thus I have to finish the game four times per difficulty. Grr! 😠

Update: (03/17)
Looks like there is no multiple endings at all. Just one. It shows only if you're reading the story for the first time.

I'm currently on set 1 level 25. This will take me a while to finish. I'm playing on Easy difficulty. I save the missable achievements for second playthrough.

Game beaten!
Difficulty: Easy

Why pick easy? Being a euroshmup with lazy enemy HP increase, this makes it hard in a wrong way. I hate games' difficulty only focuses on enemy HP rather than enemy pattern or other difficulty specific changes. So BS. I miss games' difficulty that changes enemy behavior, pattern, and other specific changes I like.

Post-game
Update #1 (21 Jul '20)
Difficulty: Normal (not stackable :( )

After Normal playthrough, I play and beaten it on Easy and Hard.

Game beaten!
Difficulty: Easy
All achievements earned.

It's so dumb that this game is super easy when Normal and later difficulties are locked until I beat it on Easy.

Game beaten!
Difficulty: Easy (less enemy HP; typical euroshmup game design)

🔴 Achievement hunting abandoned

🌟 Game beaten!
⚡ Difficulty: Easy

Why play the game on easy difficulty? Because of how euroshmup difficulty settings designed to make enemies damage spongy, I set it to lowest.

Normal difficulty
Sonay clear
-----
Easy difficulty
Selma clear

Viewed Sonay and Selma endings.

On hiatus

Post-game
Beaten all stages and objectives on each difficulty.

Game beaten!
Difficulty: Normal
Continues used.

On my first playthrough, I beat the game on Easy without continuing.

Game beaten!
Reached 60 seconds on all modes.
All achievements earned.

I have finally returned!

Game beaten!
Difficulty: Easy

Used to played Normal most of the time, but I decided to change it to Easy due to unbalanced difficulty.

Post-game
Easy difficulty beaten.

Blessing of the Campanella Pack cleared
Difficulty: Lesser pieces (Easy)

Hyper-Highspeed-Genius Pack cleared
Difficulty: Lesser pieces (Easy)

Game beaten!
All achievements earned (Base + DLCs)

Game beaten on Easy
1CC!

Game beaten!
Difficulty: Easy
1CC Easy
All achievements earned.

I have plans to replay this game and 1CC on Normal or higher.

✅ Surpassed wave 20 when playing Classic A mode on pilot (easy) difficulty.

❌ Achievement hunting abandoned

Game beaten!
Difficulty: Easy
All achievements earned.

I'll try 1CC normal and hard later.

Started playing at midnight.

Game beaten!
Difficulty: Normal

Post-game
Difficulty: Hard
Hard mode beaten

Co-op mode beaten on Easy.

All achievements earned.

Game beaten!
Difficulty: Easy (9 Pieces)
All achievements earned.

🟦 Game beaten!
🔵 Difficulty: Easy

🏆 All achievements earned.

Game beaten!
Difficulty: Normal

On my first playthrough, I've beaten the game on Easy. On my second try, I play on Normal.

✅ Easy and Normal difficulty achievements stacked.

Game beaten!
Arcade Mode
Difficulty: Normal (not stackable, grr 👿)
1CC!

Post-game
Arcade mode - Easy difficulty - 1CC earned!

Game beaten!
Difficulty: Easy

I originally intended to beat the game on Normal, but because of how euroshmup game design like this, it made the game hard for all the wrong reasons. I end up playing and beating it on Easy on every single episode. On higher difficulties, the enemy is HP increased (which is downright lazy and terrible idea) and obstacles kills you in one hit (on easy, you can take damage, but on other difficulties you can't). Like most euroshmups, you're internally under-powered in which the game encourages you to buy power-ups from the store. And to top things off, you have inertia which makes your movement feel laggy (unresponsive) as hell, plus the frame rate is not a smooth 60 FPS due to constant drops in many places. Truly a travesty of shmup genre. At least it's freeware though.

I forgot what day I started playing though. I'm not sure if my playtime is accurate, but this is all recorded from my playtime on Steam.

Game beaten!
Diffficulty: Easy, Normal, Hard (not stackable)

1CC on all difficulties.

The difficulty is just lazy enemy HP increase. Grr!

On hiatus

Had only beaten the game on Easy mode. If I wanted to count as beaten, then I have to play on Normal.

🎆 Game beaten!
⚡ Difficulty: Normal

🏆 All achievements earned.

🪙 The 1CC run was done on Easy.