Really liked the 3d environment combined with 2d sprites, SFX was nice too. Impressed that you had enough time to add a highscore system. Not sure if you’re generating them or putting them together from predesigned segments, but the levels felt really good either way.
Spikes felt a bit too punishing. Maybe they could take 2 hearts off instead of being immediately fatal. The player could be a bit smaller to make fitting into 1-block wide openings easier. Also, the UI was a bit small on my (larger-than-average) screen.
These issues were all minor though and I still had a great time playing your game!