The map is a great idea, and we were going to add one but of course ran out of time. Maybe we'll make a post-jam version IDK.
Rounded corners is a good idea, but IDK how to implement that.
There are 260 total coins in the game, including all the secret areas. There are also 9 trophies to collect, although due to a bug only 8 can be obtained. The two golden trophies are quite tough to get lol. I'm assuming you saw the one in the vault, there are multiple switches that all light up 1 light on the door (that's why it has 6 lights).