Hi. Nice theme. I like the colors in this game, can you tell from my logo?
Overall nice game, kinda like a tower defense and dungeon crawler combo.
It was a bit hard to figure out the key bindings and how it all fit together.
Suggestion - It would be nice with some way of distinguishing upgraded traps. The F to confirm an input feels a bit unnecessary, maybe have just the 0-5 buttons place or do the action directly, or if not maybe have spacebar as an option. The advancement to a new level is a bit unclear when it happens.
Bug - Strafing can take you OOB through some walls and you can enter wherever.
Controls - It feels a bit slow when moving around, and having inputs queued up would improve this. Not sure if you are supposed to spam Shift for attacking or if there is a delay there.
UI - The bottom right numbers I guess indicates level and score but it could be made clearer.
Tiles - The tiles could be a bit larger or view showing floor you stand on to make it more clear when placing traps below you or when orientating the maze.