The premise is intriguing. The B&W aesthetic is neat. and works well with the hand drawn art. Some of the text could use a bit more contrast, such as on the Pause screen, when it is over a lot of white. It looks like you have a slight blur effect, but you may want to add a darker semi-transparent Panel Container behind the text to give a bit more contrast when the text is over a lot of white.
When I started I noticed the "0" after "Remaining:" was clipped on the left side, though later, after getting upgrades it looked fine.
It would be nice if your current XP/currency was shown when you hit the upgrade shop. I had not noticed the gained XP on the Pause screen, so was not sure how many I had when talking to the shop and just bought something, then went back and bought the other. Trying again I was told I didn't have enough. After that I went to the Pause screen and saw the upgrades. Knowing it is there, I can now go check it before a shop, but it is generally good to show the currency available in a shop. Similarly, I'd prefer being able to see the current amount of something when able to purchase more. It wasn't hard to guess the upgrades provided by each item, but it also would be nice if the first time you visited the shop they told you what each was for.
After a while the music stopped. You may want to check your import settings for the file and make sure "Loop" is checked.
I saw a note in your devlog about controller issues with web browsers on Linux. I am playing using Vivaldi (Chromium based) on Linux. My controller (8BitDo Pro2) worked fine. I played a bit like that, but found the R3 to Slice messing with my aim and switched to keyboard and mouse. I like that you support many input options. With mouse it really started to stand out that holding space to be able to act was really odd. It didn't feel quite so awkward on joypad, but trying to hold Shift, Space, and use WASD to move was getting unpleasant after a while. I remembered seeing Toggle Hold in the options, and tried it out. That feels much better. With so much of what you are doing needing that aiming, it seem odd that you have the requirement to be in that mode to do things. It might make more sense to allow toggling the display of the cone, but allow use of abilities at all times. For mouse it is obviously easy to see where you are aiming without the display, while I can see that other inputs may need the display to know for sure. Still, I think that action mode being the default seems to be preferred, at least with what I have played so far. If the display of the action cone is problematic, perhaps add an option to adjust its alpha with a slider so players can have it show, but only as faintly as they want.
Finally, the biggest thing that stood out to me was the combat. The description on the web page had me intrigued by the potential options of how to play, seeming to promise the ability to play peacefully or be violent. Asside from the 1 shop I ran into, Everything was trying to kill me, and nothing other than Slice seemed to do anything useful. The trees moved for Shout. But no matter how many times I shouted at enemies, and I did try it a fair number of times, it did not seem to do anything. I tried Shock as well, but that puts you in greater danger and was much harder to do, so was tried less. Still, I did not see any effect from it. After a fair amount of redoing the first part from dying many times trying to find the non-combat options the description implied were available, I went ahead and used Slice. I tried a few more times on different enemies, but always fell back to Slice. I did try running for a while, until I thought I hit a dead end, and may have needed to kill the enemies to proceed. After killing those I could find I did find a path around the top that I had not seen before. I do not know if it was there and I had missed it, or if the killing had opened it up. I had been trying to get through from the left side where there were 2 destructable rocks, and several I could not destroy or pass, and those were what I thought might be tied to killing.
I think it could use with a tutorial, including a bit more info on how and when to use the abilities other than Slice. It could also use with a bit of rewording to better prepare the player for the need to do a lot of fighting, if it is indeed needed. If there are ways to not fight, then a bit more guidance on how would be good.