Alright, so a couple of technical stuff first.
The option menu in the web version doesn't work, not sure why. Had to download the game to be able to reduce the volume of the music (it's too high :P).
There is not feedback when I click on a card to tell me that it is currently selected, so it took me a while to understand how to put the cards in the top row. Having a system where you can drag and drop them would be more intuitive.
The game was interesting, it felt like there was some strategy involved, but it felt like the characters at the back of the row were just waiting to be hit on. Would have been nice if they had some power like "Attack over the first 2 characters" or "heals the character at the front" or "provide shield for the whole row". Feels like there's a lot of potential here if the idea went further with those mechanics.
I liked the Dragon Ball aesthetic of the aliens :P And it was pretty fun to try and make a line-up that made sense to kill the other team. Overall, great job!