sound track is very simple and dialogues is quite bad, jump puzzles hard is not mines but track resets every time you die and is very annoying, you need or make longer puzzles or by codding make track unresetable. But it's not bad for one developer especially if thes first work.
I mean, I would agree with most of what Anav said. Especially regarding the repeating music, I would really recommend not resetting it when the player dies. However, I think the length of the levels is good, especially given how difficult the game is; shorter levels are a lot less frustrating. Hopefully, that helps :)