Great idea. I really felt pressured in each of the levels. It might be nice to give a count of how many slimes get saved at the end of the level, rather than just end the level as soon as you save 5.
If I'd had more time then showing how many cubes reached the end rather than just saying 5 would have been at the top of my list of features to add.
Thank you for playing the game and for the feedback.