Thank you for playing, and I'm glad you liked it :D
Jumping while walking adds an amount of momentum that felt strange and I always overshot my jump
That is true, I mainly had walking as a chill mode or to do small adjustments (since it's really the only way to move "slow"). I'll be tweaking the walking mode if I can in an update postjam :)
The transition into the underground feels really long to me. I assume you're actually falling all that distance?
Yes! You are falling all that way for both the distance and for a loading transition around halfway to unload the overworld (I do this in a few spots). This one is particularly long due to the distance, and to give a sense of "wow I'm still falling, where the heck am I going" haha. I may look into adding a rock or something midway to show progress but I'll see if it fits :)
Checkpoints seem a bit unforgiving in the first part of the underground zone.
Is there a particular spot in the first part that gave you a large amount of trouble? If you want to timestamp it for clarity I have a 100% video on the game page, and if you can say what you mainly had trouble with at those spot(s), that would be helpful!
However, the controller controls felt a little odd to me.
That is actually true, as controller support was a happy accident. When I set up my action maps I did controller keys right at the start then forgot about it until afterward when a friend used them for the first time (since I mainly use kb&m). I'll do a remap for sure!
As for the platforming, I tried to make small "movement" hurdles such as in the underground with the steps up to the temple. I think it's the 2nd step that requires you to know how to chain jump to gain height for getting up there. Or the underground entrance getting the hang of long roll launches, and using jump to get a farther distance via coyote time. Or I often add slight lowering of edges, or slight angles to indicate a jump off point, etc. I may have messed up in a few spots, so if you come across some that aren't great to you, let me know (if you want to) :)
I did not find any cosmetics, I assume I didn't play long enough to find them.
You can come across a few really early on if you know where to look ;) Others are in plain sight depending on the area. But yes I liked adding those, they were fun!
I hope that didn't come off as negative!
Oh this has all been great, none came off as negative don't worry!
Post jam I'll be doing an update with various tweaks, a few starting section changes to better enforce what the basic controller movement can do (and a few bug fixes), and some checkpoint tweaks (+ one additional one somewhere).