This is a so-so top down shooter. Alien design is pretty unoriginal, there are more pallet swaps that I'd like and the sound is boring to say the least. Actual design is decent, with good upgrades and weapons. It was bearable, even partly fun, until wave 26. I don't care what anyone says, until I do it myself, it's unbeatable without the Mochi Coin bonuses. Full upgrades, weapons, perks and the 4 best buyable mercs, and you die before you can even finish one side. There was WAY too many enemies, with too high HP. I might try one or two more time, but that's it. I dont' like having dying, watching an ad and having the submit score thing appear before I can restart.
I understand you want to get paid for your time and effort, that's only fair. But you CAN'T ruin the experience for it. That's just a bad choice, and people are just gonna get mad at you for it.
I'm giving you a 5 because while it's not stellar, it's not terrible either. Just not beatable.