It was a lot of fun, a lot of times I felt clever finding the multiple ways to use the simple mechanics, the Qs are cute, the music puts you in a good mood. The puzzles ramp up in difficulty and end up with a satisfying chain reaction at the end. The level design over all felt well structured and the graphics are a pleasant.
It might be just me but the diagonal bounce really annoyed me at the beginning then I started to master it and it felt great even if I was accidentally killing the Q on the spikes from time to times.
I like the fact that we are saving the Qs and they join us to save the others but I found myself with number 3 and 6 at one moment and the others became useless. It was a bit confusing when I had to switch sometimes (Oh, where was this one again ?).
It might be interesting to reorder the Qs when you get to a checkpoint and so removing those that are not necessary anymore and making those that you are using more accessible on your keyboard.
I hope you keep developing it
ThanQU for the game, Good luck