The browser experience is pretty good! The AI makes some weird moves sometimes (i tried the hardest mode), but it's pretty good for in browser. The game is very responsive.
I think, clearly the biggest flaw this game has, it's very hard to know what move we can do. You should show what squares can a piece reach when you click on it. It's a basic feature of chess websites, and it's even more required when there's new pieces. It's even worse when the custom moves arent intuitive to execute. I have no clue how to perform the 'telekinesis' move for example.
Also I'm not a fan of how the board or the pieces look, I don't think it helps picturing the moves either lol.
Also it's not clear whats a 'Banshee' is too from the Bishop's description.
But all in all I had a lot of fun trying to beat the strong AI. Good luck with your project! If you have a discord I'd love to try the builds and give more feedback on balance and whatnot.
edit: okay i found how you can do telekinesis, but you cannot do it when you're in check to block the check?
Also Fighter is already OP but it's really weird how it cannot take the King on its second move i gotta say lol
Also lol you can really take every pieces with just the Warrior piece only, even in hard difficulty.