good concept! as far as a test of the core gameplay goes, i think this proves there's some merit here.
some random thoughts:
- maybe try adding an option to render the game at a lower resolution? that should help with performance on mobile devices, which often have very high resolution displays but wimpy GPUs
- the robots are cute, but i wish they had more upgrades. maybe add another item like a screw or something that makes the robot stronger for every one in the combo, and perhaps a one-time upgrade that gives them an AI that targets lighter objects before heavier ones? i kinda like them being really stupid but also kinda don't.
- hole-man is shockingly more of a hindrance than a helper. if he targeted items he would be amazing tho
i'll definitely be watching as things get fleshed out, i can really see this goin somewhere :D