I can see where this game is going and its really interesting. I like the setup of having to balance the encounters. The game looks great, the art style with the slighly rough and cartoony style is great and works perfectly for the mood. The music is also really enjoyable although it is set very loud by default, I appreciate the volume slider.
The biggest changes needed are just giving more information to the player. For some reason I went left when selecting a monster so I chose a goblin and instantly killed the party. I realise the slime looks softer but between the goblin, skelleton, and spider it didn't seem like the visuals were informing the danger level so I discarded that fact. Seeing a rough idea of the moster threat, even if you aren't given the exact stats would be great. There's also no indication that the heroes are buying anything from the shop and I spent a long time looking for something my mouse could interact with to sell items. Also the game soft locked for me on level 2 very time.
Really good premise, I would be excited to play an updated version of this.