I will just begin by saying that I am probably not the kind of player you target.
The controls are interesting, but it took me quite some time to figure out how to pass the gap using the head slide. I'd say that it feels kind of unintuitive to have the slam on the same button.
The game feels super hard and unforgiving. I took me 10-15 tries just to beat the green thingy and then I cornered myself in the bottom left side only to discover that I have to do it all over again. I feel like given the pace of the attacks it feels impossible for me to not die at least a couple of times. This does not feel rewarding enough for me to continue, I just wonder when it will stop.
The tutorial explains all the mechanis at the same time, which is great. But then you enter a level and you only use the jump and the enemy is not the one you saw in the tutorial. I think that if the level had been split in "rooms" where one room is one enemy I would have played a bit longer. You could use tutorial between these rooms to teach what the player needs for the next level.
I still played until I reached the weird big ball that almost instantly killed me.
Congrats on making a game !