A friend of mine wrote this game, and recently I have contributed a bunch of levels and some code for it. You can get it free for Android, Windows, Linux and Mac. You can also pay a token 0.60GBP on Google Play.
It's vaguely lemmings-like.
On the play store, search for "Rabbit escape" and find the game with the orange rabbit icon by Andy Balaam.
https://play.google.com/store/apps/details?id=net.artificialworlds.rabbitescape&hl=en
Get it here for all platforms.
http://artificialworlds.net/rabbit-escape/
After you complete it, submit new levels here
https://github.com/andybalaam/rabbit-escape/issues