Every once in a while in game jams you find talented programmers with an innovative idea. This game is it.
the idea of solving puzzle and killing enemys by being an amalgum of magnets is the kind of crazy idea that I would dismiss because of the challenge of programming it. You did an great job with the physics simulation, with the ideas (having solid, semi fluid and fluid was really smart). getting used to the controls and what each mode meant was awesome.
[spoilers] The puzzles are on point, and each uses different mechanics. Many times I see puzzle games using the same mechanics over and over again without anything new, and this cant be said for your game. The robots animations and having no sound is a bit lackluster, but to me the game shines even without that polish.
Conclusion: to me, this is what an interesting game jam game is. it can clearly be expanded, and IMO would be a succesful game if done. Great job!