first, Love the color palette, it really does go a long way.
on paper, the casino ability sounds like an interesting mechanic, in practice it just makes you to have to wait a lot of time doing nothing before actually attacking. a potential fix is to drastically shorten the reroll time, even to the point that it happens almost immediately, don't punish the player for rerolling by letting him run around doing nothing.
the player moves very fast, and is hard to control, try to limit the movespeed.
lastly, enemies are also super fast and unpredictable, it makes some of the damage you take feel a little cheap.
still, you finished a game in a very short period of time, and with a little bit of tweaking it can be great, just finishing a game is a huge achievement, be proud of your project and good luck on the next one (;