On my computer and browser, the browser version is zoomed in so that you can't see the UI, I had to zoom the page out to see it.
The game isn't super hard, but I found the mechanic of towers getting fucked when they get defeated, and being un-redeployable for a while afterwards very interesting. It could create an fun and unique gameplay experience of constantly managing and repositioning your towers. However, there's not really a lot that causes this to actually happen. Once you get all your towers down, there's not a lot the enemies can actually do to you that would necessitate that. And once that happens, the game is pretty boring since you can't even place more towers. Some sort of occasional/temporary threat that could defeat towers without being too threatening to your actual base health might help with that. Maybe the enemies could shoot projectiles?
The game's UI is also a bit hard to look at. The constantly moving backgrounds and images on the tower buttons makes it hard to read the text on them. And I misread the text as "50P" instead of "5DP" for quite a while, and was confused why I could still place towers.
I think the towers need something more to distinguish them from each other besides their ranges. If there is something making them more different, it wasn't very clearly communicated in-game. That would let the player feel more strategic when choosing which towers to place where.