Very impressive game!
The controls and gameplay are great. I really like that you get a choice between melee and ranged, and that the dash is properly interwoven with the gameplay. The enemies and environment can both pose a really decent challenge, yet nothing is unfair at any point.
Amazing artstyle! I'd play this for the art alone. Besides looking very GB-like, it has a great, whimsical attitude to it. Wow.
The music is great. Some tunes stand out to the listener more than others, but that's ok. It did its job well, and helped communicate the setting.
Huge level of replayability. The roguelike aspect of the game isn't overbearing at all, and only enhances enjoyment of the game. Because of the game's whimsical personality it makes it so that traversing what are essentially very similar rooms doesn't get old at any point.
There's even a little story! It's adorable, I love it.
Overall, congratulations on this entry. Maybe I'm biased because I love Japanese and Asian culture, but I loved the game!