Thanks for your feedback. The ways you where supposed to solve level 6 and 7 was using a full tower/stack and then demounting the top one in order to boost it up and barely on to the top platform. This might have been the tricky part. As I have just realized, you are totally right about the fact that the walls are also treated as ground layers, this combined with the a bit to big ground check area might have been the reason you where able to other things when sticking to the wall. Again, thanks for your feedback.
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Wow! I tried again and stacked them all up and reached the top platform! I actually thought about using a full stack and demounting the top one before but I couldn't make it work. The reason is that I always press "E" after I already stacked them up by jumping. Now I learned the proper way to mount. It's a lot of fun to solve the levels again using the right technique! By the way, welcome to rate my game!