Pretty nice idea here, just needs some tweaking to really shine I think. The random enemies spawning below you on tight platforms kills runs a lot since you can't really attack underneath you, same goes for enemies spawning in a wall tunnel that will block your path and hit you without you being able to see them.
I think the spikes are also a bit rough, sometimes they spawn you right next to a spike instantly, so if you are holding a movement key you just get juggled and die if you have low health.
It also took me a couple of tries to figure out the "secret walls" Maybe make one very easy to find to teach players they exist? I tried to pixel perfect jump into the room you need the dash to get to about 10 runs before I found the hidden walls because it looked like the only way forward, and the jump looked doable.