Thank you for your feedback!
Sorry for the trouble regarding the missing save feature and the game instantly shutting down when you hit exit. A save system would have been the next thing on the list of things we wanted to implement. But I'm happy to hear you had some fun anyway!
We had a lot of ideas, the map was supposed to be much more complex and there were plans for lootable equipment (even multiple weapon types) ...dream big, right? We didn't consider the more casual mobile route but you're absolutely right, this could actually be a really good base for a mobile game.