Here's some feedback on your game:
1. The theme
I like the idea of the random movement and that the enemy can do the same things as you can, but maybe make it more into a tower defense game than a "just place it on the enemy"-game
2. The gameplay
Unfortanetly, the gameplay isn' t that fun, mainly because i don't really know what's going on. I can't figure out what all the symbols do and mean (especially the one on the right) and i would like it if you could change the position of your base so you can place stuff somewhere else. Also, give the player some gold in the beginning and then just give them gold if they defeated enemies. Same for the score.
3. The graphics
The graphics aren't that bad, but choose a nicer color scheme on a site like Coolors.co and a better font on a website like Google Fonts.
4. The sounds
The music and sounds are okay, but a little bit too generic. The music reminds me of something, but i don't know what...
I hope my feedback helped you, and it would be nice if you could check out my submission too! Thanks! :)