The controls for this are mildly stiff to say the least, jumping from platform to platform requires extreme precision, otherwise you're gonna miss it. The hit detection is pretty janky at times, especially when it comes to when you swear you hit something but didn't. The enemies are, for the most part the most challenging part of the game. I mean, they're supposed to be right? Well, there's one enemy that I have a HUGE gripe with: Those skulls that shoot fireballs. I swear, like half of the deaths I've had in this game can be attributed to those things alone. If you could just destroy the fireballs with your attacks, this game wouldn't be so frustrating. I get that it's supposed to be extremely hard, but when it's hard because of bullshit game mechanics and enemy placement, then it's just straight up bad. There are some rooms where these fireballs make the game genuinely impossible because you avoiding them is not based on skill, but rather it's based on the chance that the skull enemies aren't shooting them in your direction. "Underground Thorns" is a good example of how NOT to make "challenging" games.
This game could definitely use some reworking, because I feel like this could be a decent game otherwise.