The controls are extremely floaty, making it easy to crash into stalactites or enemies. The art is competent, the sound unobtrusive, and the premise fits the theme. Looks to meet the four-color limitation too.
Getting a jump sound attempting to jump when already in the in the air is funny at first, but becomes a hindrance when the player graduates to hops at some point in the platforming, losing the ability to use audio cues to determine if they should DI their jump or not.
In all, it has the feel of what's normal for a game jam game: the core gameplay, enough art and music to get the feel across, and not a whole lot of polish.