There's an impressive amount of work in this for the 1 month time period. Not sure how much of the systems and assets were made specifically for this contest (as it looks like this game is a part of a series), but kuddos.
The dungeon system was pretty cool. I like the TP management and the branching dungeon and random battle/trap difficulties were neat (although exploitable through save scumming, but what can ya do lol). I had a rough patch where because the only healing can be done with a skill that costs 25EX in battle, I had to pray I could build up enough EX before getting killed. Not sure if there were items somewhere I was missing. If not, adding some alternative ways to heal might be a good idea, otherwise a player can easily get stuck.
Storywise, I wasn't too engaged. The characters were talking about things I have no knowledge of. Outside of the intro tho, the story didn't seem to matter too much to the dungeon crawling gameplay.
I feel like it would be better to roll the dungeon and battle tutorials out a little slower, That section of the demo felt veeeeeeerrryyy dense and it wasn't easy to retain the information that was dumped on me there.
The battle system was nice. The sprite animations are fantastic. All the different poses Gunner takes while firing his bow had me laughing. Sadly, the game locked up in one of my fights and crashed. There was, weirdly enough, no error screen so I'm not really sure what happened. I stopped playing around there.
All in all, this was an impressive showing! The gameplay greatly outshines the story and characters.