Shockingly good. This is only an 8 out of 10 due to a few levels (mostly in the later half of the game) that really annoyed me, particularly e4m2 (fuck the platforming) and e4m6 (fuck lava floors), which felt designed that upon first run through you'd be out of heals and die. While e2m6 has the benefit of once you know what to do its fine, e4m2 really just...sucked.

I definitely plan on replying this one day with a secrets guide, and could easily see myself trying to beat levels faster and faster. The fact that a game from the early 90s is better than most games coming out today blows my mind.