As Wietske said the game unfortunately is missing some files to work properly! If you don't know how you can do it, Brackeys made a video to explain it, like for everything else! XD
Viewing post in RoboBattleBuddies(SEE DESCRIPTION) jam comments
Thanks for the info! I took the time to iron out some bugs and got a decent amount of them (getting hit sometimes temporarily breaks walking animations, but it will sort itself out when you throw and attack) and I re-uploaded the game here if you want to check it out just for fun: RoboBattleBuddies by VanBurace (itch.io)
Ahh, I was afraid that part might not be as obvious. So the gem on the tongue has a damage check, so you need to do damage to it equal to 3 heavy attacks before the screen gets too green to avoid the attack, and the boss will take a big burst of damage on your next hit. If you want to return to this game and try to beat it , the next bosses each have mechanics that require you to respond correctly or you will die. The correct actions for those are as follows: the second boss has a red laser that does damage per frame, so it will almost certainly kill you, and you use the wall ability you get from boss 1 to block it, and the last boss has a force field that pops up and has a similar mechanic to the green gem, but you need to use the laser ability from boss 2 on the force field to stop the attack and put the boss into damage phase.