It's fun, there is a lot of really great aspects like the art, animations, and music in particular are very cohesive. The game is fairly basic in general, but I mean it's a jam game so... it lives up to expectations hah.
I know it's meant to be difficult, and the difficulty curve of the level design is good. However, after losing 1-2 times near the end, it feels kinda frustrating/tedious to trek back through the easy bits again. I think a checkpoint system that also leaves you with the same amount of time you had when you originally reached that spot, would be nice. (And you could fully reset to try and speedrun to add more time to your checkpoints I guess).
Also another aspect regarding the difficulty, it's pretty harsh that each death loses 10 full seconds, I think. Maybe a progressive system would've been good, like one death loses 3 seconds, then 5, then 7, then 9, then 11, etc.? With a system like this you could curate how many deaths a player could have, too. As it stands, I think you could have 6 deaths with perfectly play and finish with a couple seconds remaining. The floaty movement contributes to the difficulty, I found myself having to stop every jump early by holding A mid-air, which is fine. But it did eventually become a point of annoyance due to the points mentioned above
I don't mean to talk about the difficulty so much lol. I beat the game in 5 tries, with 39 seconds remaining on the last one - I don't think it's that hard. But I could see that the difficulty seemed intentional, whereas a lot of the other aspects of the game are pretty basic or repetitive so I didn't know what to talk about, haha.
Overall for a jam game, and especially a newbie game, this is really good. With a little polish it could be great, excellent job!