I don't think using force was the right call for the movement. It makes the player move like a vehicle not a person, its possible that tweaking the settings might have helped but in a top down game like this I was would have just moved the transform or used straight velocity.
I made it to the big skull room but couldn't figure out how to get to him. I stepped on a black square and instantly died. It wasn't clear that would happen. Maybe I was supposed to warp? Like most people I forgot about that ability and didn't use it much.
I did have another go and fought the big skull but I tried to warp over the black squares at the back and I must have got too close because I instantly died again. I played 3 times in total and each time it was the black squares that got me! As a player I found it frustrating to die instantly with my health bars full every time and then have to go back to square 1. Maybe some sort of "lives" system or just restarting the level would be better
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I don't think its clear that they're trapdoors. I had the conversation and went into the room, then the big skull does his speech then I had to warp over 2 black squares to get into the "arena", after I'd killed the 2 towers, I was fighting the big skull but I wanted to go behind him and there were big black squares at the back but grey ones behind so it seemed like I should be able to go that way but I went over to them and died instantly and I didn't want to play again from the start