A nice game with very focused mechanics, I liked it.
My only complaint is that jumping while climbing up, which I did naturally quite often, seemed to cancel the jump somewhat and made avoiding spikes much more difficult.
Then it would be quite difficult to get other people to play your game, since you need a Roblox account to play any games made there. Not everyone will go and make an account just to play your game
In the part where you collect 4 keys, when you collect a key Madeline is transported back to the start in a bubble. Her hair in the animation is the wrong color, it should be red but it was pink.
Very nice! For some reason, after I died and respawned in the first room, the game didn't respond to any of my key presses and I had to Alt+F4 out of it.