So yeah, this is alright. There are shortcomings, but it's not bad.
This game consists of a level-based structure in which, in every map, you need to beat all enemies before a portal appears to lead you to the next level. Pretty standard stuff, and not terrible. It's a roguelike, so you die permanently and the levels are randomly generated.
The combat is a bit annoying at times, especially when you throw all your boomerangs and have to pick them back up real quick, but it's quite fair and enjoyable for the most part, with some juicy effects and easily readable enemy behavior. I do hate it how our boomerangs just sit there and we have to pick them back up, but I love how we can hoard boomerangs and throw all of them at once at certain enemies.
Cutting through grass is satisfying right from the start, and cutting through stone becomes gradually satisfying the more boomerangs we have. Other than grass and stone, sand is an environmental hazard that makes you move slower, and that's it. The environments are okay at first, but it doesn't take long until they start getting kind of samey. I gather that this is a jam entry, so it makes sense that it wouldn't be super varied and full of content, so this is forgivable.
The lack of music makes the experience a bit more monotonous than it has to be. I'm not sure if the game really lacks music or if it's just my browser acting up, but it made the game a bit boring for me. Is it the browser, or does the game really not have music?
The game gets repetitive quickly, even with the occasional new enemy being added every handful of levels, for all you do is walk around, kill the baddies, occasionally find a shopkeeper, and move on. The game has got "metroidvania" and "zelda" tags, which I find weird, as there's no meaningful exploration or adventuring in it. The only things you can find by exploring are some more cash and the occasional shopkeeper, which you'll more often than not have insufficient money to buy their stuff.
This is a jam entry, though, so of course there wasn't enough time to make a fantastic masterpiece of profound complexity, and what little this game has is pretty solidly implemented. I really don't like having to run around enemies to pick my boomerangs back up, and I do feel like the game becomes repetitive too quickly, but it's still a pretty solid time killer.