Entertaining gameplay loop, I love that it's a much more rigid platformer than, say, Mega Man, every move needs to be planned and you need to play carefully because jumping, for example, cannot be canceled and you need to commit to every action. The level design is generally pretty good and there's much room for you to use your movement to the best of your abilities. I love the individual abilities and how each has its purpose and different enemies they're good against. I will say though, the difficulty progression is kind of fucked, Frankenstein's level is smack in the middle of the game and I easily spent the most time there, the other two following levels are way easier and it doesn't feel as natural as it should.
Visually I think the game looks generally fine, I love the art direction's musky castles and old Universal horror movie monsters for bosses. The Mummy, Frankenstein, and Dracula are bosses, and hell the Creature from the Black Lagoon is a regular enemy, which appeases the film student in me. I think the character sprites are detailed and animate fluidly, but the environments are a bit messy, many backgrounds look like a clusterfuck of messy tilework with little cohesion. The soundtrack is amazing though, each level tune is an earworm that I found myself humming throughout the day, it's just passionate 8-bit glory, Wicked Child was probably my favorite of the bunch.
Overall, a very solid platformer that benefits from a great gameplay loop, fun levels, and a fantastic soundtrack, but occasionally unfair difficulty spikes and messy graphics do drag it down a bit.