Aesthetic, sound, music, physics/timetravel are all great. Good job on that front. The movement felt a tad fast, but the main thing that felt too fast was the crouch slide, it's just so quick it feels a bit slippy. Though I will admit it helped a few times when in a bind, it also got triggered accidently and killed me a decent bit. It currently feels a bit weird that the world has warps and teleports currently, given how linear it is besides getting some keys. I imagine that metroidvania elements will be added later though, so for a base of that future system it looks good.
Subjectively though I didn't enjoy this nearly as much as I thought. I was never a fan of a ton-of-deaths games like IWTBTG, but this game was definitely better than those since the time travel makes the time loss almost non existent. Regardless, the amount of deaths made me view the game differently and it felt more like trial and error than my skill at times. That was especially the case by the end, but I imagine that's on purpose in reference to kaizo.
So yeah, game's really good, right up the alley of many gamers, though not for me I think.