not sure but a quick search seems to indicate that it’s itch or godot that needs a chromium browser.
Viewing post in Riddarspelet jam comments
Yeah, seems like it. Nice game by the way, I like how mellow it is but I would say it is way too easy. If you just dump all your money into more knights and don't think about the castle health at all you will eventually be able to finish a level in only a few seconds. Using that strategy there didnt seem like there was any difference between waves, the difficulty went down if anything.