Hey, I gave your game a try. It worked well in Linux for me (using Wine), seemingly no hiccups. I like the theme and the visual style. I see you're starting a similarly looking project about zombies, and have to say I prefer the more original theme of Land of Flies
The interface and gameplay seems solid enough, although I did somehow lack a feeling of urgency. Just being dropped in an infinite world and told to collect as many ?-s as possible felt slightly unfocused. If you expand the project, maybe you could give it some more direction. Like, secrets could be put in special places, and provide clues as to where further secrets can be found ("Follow the river westwards to reach the Temple of Beelzebub"), or something like that? I would also consider adding fog of war to make exploration more exciting, though the game might do fine without it, of course.
Content-wise, some stats, monsters etc. felt a bit samey. For instance, there seemed to be little practical difference between armor points and hit points. And what's with the several different kinds of spray (I get the impression they are basically the same, or is ant spray extra deadly to ants, or something along those lines)? Similarly, separate counters for food and water didn't feel like it added much.
Enemies could also do with a bit more variety, I think. Maybe spiders leave cobweb, which cost an extra turn to move across; or different vermin could have different behavior. Eg. flies could move more or less at random, whilst ants make straight for you. The current ai, with the insects mostly keeping a certain distance and trying to block your path made it more or less impossible to avoid letting them hit you first. It was also hard to predict when they would suddenly move two tiles in a turn, making it difficult to navigate around them. It would be nice if there were more viable strategies to "read ahead" and squash or avoid bugs without getting hit (maybe there are, and I just didn't notice).
Hope you can use those first impressions for something. Good luck, full speed ahead!
As always,
Minotauros