Overall it's a solid game.
The art is okay, although it felt a bit plain for me and the gameplay is good following some kind of incremental structure, right? However the music destroyed my ears. In general it sounded good, but when the track ended, sometimes it made a very high pitched sound for several seconds.
A visual indicator for the area you're absorbing would be good and the upgrades feel kinda useless, specially the jump one even with one or two upgrades.