Another great fun platformer starring a very square character, just as good as my other favorite squares: Super Meat Boy and Mobility. The jump drinks and reversible gravity are a great combo and their explanations are the perfect sort of quirky nonsense.
I've only played the first five or so levels so I can't comment on length or replayability, but so far the difficulty progression is spot on for this old school platform fan with middling skills (been playing platformers since I met Mario in 1985 @ 5yo, then started making my own such as Flyboy).
Unfortunately I need to report a bug effecting keyboard controls on Linux Mint 18.3. Whenever I press any arrow key, whether in the menu or in the game, it just keeps going in that direction forever. This makes it impossible to use the menu or play the game unless I sync my Dual Shock 4. I prefer to use the keyboard for short game excursions