Thanks! I used medibang to drawn all my arts. Also if you didnt find where to go after the first boss, it was on the left of the room before the boss. Although the second area seem a bit unbalance at the moment from what i heard, so you can wait for the post jam update if you want to.
196 days ago(+1)
If you mean this ledge you can try jump then upward dash to get up, then you can go left to continue. I probably will add ingame guide for this in the update.
During my first playthrough, it seemed to be working. I tried many times in many different ways and just couldn't reach the platform, however I gave it a second try tonight after rebooting my computer and it seems to be working fine—so it may have been something on my end, especially if no one else had this happen.