Thanks for the feedback, I had felt the first boss would be hard to predict so I put in two animations when the animation cycle had finished would have been when the action would occur, eg. Legs fully outstretched would jump up and the drill animation would go downwards.
The third boss is tough, there is really only a fraction of time where the bomb's explosion can be placed in the path of the tank below and there wasn't enough direction of how to damage it beside from a little blurb I had in my description. I usually just waited until the bomb's spawned on the lower levels and stood in between two horizontal floor panels and dug so I wouldn't have to be in contact with the bomb itself.
I put the third boss together in 40 minutes leading up to submission time and put the whole game together in a week, so a lot of rough edges and tinkering needed but thanks for still persevering. I kind of treat your playthrough as the litmus test, if you weren't able to beat the game, it must have been punishing. The game is beatable but certain strategies needed to be communicated to the player just starting out.