This is a super fun concept! Climbing a giant set of stairs to both assist and be assisted by little creatures is extremely cute, and I love all of the designs you've done. Each new creature was a delight and the player character has a real powerful, persistent vibe to them.
The creatures spinning around the player and knocking into one another is great. Sometimes I found they can knock a new creature off screen before I can grab it which sends it into a wild orbit, so trying to ease that out a little might be nice. I think it would also be appreciated if there a little more indication of upwards progress, even through just slight changes to the stair and BG colours as you go up.
Overall just incredibly charming though, I truly love seeing this little guy scoot up some stairs with their friends.