I like the concept and the art style, the level design is good. There are some things I think could be improved.
Something feels off about the touch joystick. It seems to greatly favor diagonal movement, especially when held at less than full force. Making it difficult to move the character straight vertically or horizontally.
Even with keyboard controls, when you walk into a wall at a diagonal, the character gets stuck, instead of gliding along the wall as you would expect. And you bump into walls a lot, with how narrow the corridors can be. I have to be conscious not to press two directions at the same time, for the game to be playable.
For these reasons, I think it would be preferable if movement was constrained to 4 directions in this game, unless the diagonal movement controls can be improved.
One other thing I noticed is that the goblin archers' hitbox is too big. You can die from your foot touching the air above their bow. You may know this, but the hitboxes are important in this game in particular, because the player is encouraged to get close to the enemy to place bombs next to them. As a general rule of thumb for 8-bit style games, I would recommend starting with a rectangle that is the width and height of the character's body (not including extremities like hair and ears) then playtesting and adjusting from there.
EDIT: Since the game has been updated, the movement when walking against walls has been improved, and the smaller hitbox on the archer goblins feels more fair. Although with those issues fixed, I find that there are other things getting in the way of me enjoying this game. It's frustrating the way that bombs detonate instantly when an enemy touches them, and how the character loses all momentum when placing a bomb, but that's probably mostly because it goes against all my muscle memory from the way that placing bombs usually works in other games, especially Bomberman.