Hi Indrah LadyPotato,
Thanks for playing my game and leaving feedback!
Time constraints limited the number of sprite animations I could feasibly finish. I would definitely add more in a future update. The map art was custom made and drawn by me. Only a few decorations like the computer monitors, doors, and dead trees came from the base MZ resources.
The difficulty spike of the boss fight was an unfortunate side effect of having to cut some of the initial maps which would have given the player a chance to become more powerful. I intend to fix the balance issue of the upgrade/leveling system to make the game feel fairer.
During the boss fight, I did want one of the tentacles to drop a recovery item for the player to grab. Both a heal and a guard skill for the player were also ideas I had floating around.
Hopefully I'll be able to tackle these things in the updated version. Thanks again for your insights.