Bug: The lava and the acid if u put u hand to block it like going down u cannot die (the hand no can be destroy) Suggestion: that objects can be thrown, for example: the sword
idk i dont think that is new at all we have items on that, better only add a ui on the select robot the weapon select in his hand at the start, and that with the others robots like Supreme Duelist Stickman
You could make a new difficulty where the robot stops before crashing into the laser like in that laser map, you could also add that they are aware or avoid the black hole
To have a multiplayer they need buy a server, check the server prices, or well they can do with wifi, only need u make the server(Free on u wifi) and u friend join at u wifi