Visuals and audio meh. I however do love the idea with the walls closing in to climb up and the pentagons used as pointy thorns / rocks sticking out to crush you, even though I didn't think it was much ''fun'' I do believe the idea deserves a decent rating. I think if it looked better and had better music I would be more inclined playing this. Could give Rayman vibes.
I'd also add some glowing orbs that you could collect on the platforms and some odd placed extra hard platforms where you can earn extra points with.So you have the challenge of deciding whether you'd want to continue the easy route or try the hard route but possibly lose.
Sidenote: I'm from a French speaking country, we use azerty keyboards. Which make the buttons not match what to press. Might be handy to also allow the arrow keys as a quick fix, since mouse isn't used.