itch.io

 I had a lot of fun playing! The tutorials were detailed and helped me get into the game easily. It would have been nice to have an object in the scene to indicate where the tutorials appear. The checkpoint system was great! It made playing stress-free.
 As a player, the movement is very fast and it was fun just to move around. I wish the air controls were freer. 
The collision judgment for the Colossus hand worked perfectly, which made me think it was a well polished game. I wish there was a keymapping for quick hand movements, maybe Shift + wheel?
 I liked the variety of levels and new gimmicks, and I thought it was clever to use coins to drive the player's behavior. I think it would be even more fun to invite a friend to play two-player!

I can see play button (Run Game) on PC and mobile. It would be great if I could upload a executable build, but currently, uploads are restricted. Next time, I'll upload a downloadable file.

Thanks for the advice.
I think I was lacking both skill and time to make the idea interesting.
I will try to expand the idea in different directions as you said.
Thank you for expanding my thinking.