Pretty solid arena game! The tutorial was efficient in teaching me how to play. There was a good variety of upgrades as well. The sounds and visual effects made taking out swarms of enemies pretty satisfying.
Do you wish the game was bigger?
I think that depends. As a free game, it was a fun mini-game. If you decide to later charge for it, I think the game would need more content. Perhaps more upgrades, enemy types, traps, arenas, etc. But as-is, I got my fill of the game. More content would also encourage me to come back to it.
Did you launch the game a second time? Did you want to play more?
I only tried the arcade mode. I'm considering trying the endless mode another time. I could see myself playing the game again for a short session, though I feel like I saw everything there is to see and completed it in one try. Because of that, there isn't a strong desire to revisit it. Leaderboards don't motivate me at all to replay it.
Suggestions
When trying to place the signal, the upgrade menu popped up and I clicked an upgrade by accident. Maybe you could prevent this by allowing the player to activate the upgrade menu once the meter is full instead of it appearing automatically.
Also, the game is pretty easy. I managed to beat the arcade mode in one try without losing much health. I think this hurts the replay value. Adding harder enemy types could help with that. Maybe some that can set their own traps or shoot projectiles?
Overall, this was a pretty fun game. I liked the variety of upgrades and luring enemies into traps was a lot of fun.