Loop through the same level over and over again, gaining cash from killing aliens and buying upgrades. Once you are strong enough to defeat every alien in the level fast enough, you will be able to move on to the next one.
AtomicDouche Level 14
I loved this. I liked the art, and the sound effects, the design and the plethora of types of enemies, their given spawning place, and the amount of powerups. The missles were especially fun, I don't know if they scale with the player's damage, but I assume they do. It would have been nice with some 8-bit music like Gauntlet II (https://www.youtube.com/watch?v=EVJLMPE1pLM). The "only buying one thing per death" was kind of easy to cheese, but the difficulty of the overall game held up very well. It never got too hard or too easy. I played it for way too long.
I had a ton of fun with this game, but I definitely feel like the price of the upgrades doesn't increase enough, it was easy to max out everything very quickly. Secondly, I could still buy the maxed out shot frequency and it even increased the stat. I like the game's concept a lot, but the balancing is off and gets even "off"er with time. Hope you can fix these things if you plan on releasing a post-jam version!
Edit / Addition: The game starts to lag after a while, this is probably due to all the green goo on the floor, try drawing the goo to a non-self-cleaning surface and then delete the goo object, if that's what you're doing!
Edit / Addition 2: When going too far with the maxing out of the shot frequency, the game completely breaks and you can't shoot anymore, AT ALL (except for one single shot at the very beginning)
Kylazaur Level 4
So I did have fun with the game however there some little nitpicks I have :P, wasn't a super fan of the pink thing that'd inst kill you kill too many aliens, it's kind of easy to cheese the game, at first i forgot what move was and i was just shooting them from the same position as their spawn is the same area, from what i seen it seems like the upgrades only work once? the price goes up and you can get more of the same upgrade but it nothing changes? and I would of loved.... loved loved loved to of been able to get as much purchases as i wanted before continuing xD, great job though, really cool idea ^.^
Panda-K Level 15
I had a lot of fun with this, but didn't continue after the framerate tanked. Are the monster corpses objects? You might be able to improve the performance by making them background sprites.
Mcwequiesk Level 10
This was really fun! The major issue however is that by level 5 or 6, and after so many deaths and upgrades, the performance really started to take a hit. It made it very tedious to play, just to die anyway.
I did like the unique mechanic of upgrading when you die, but I found it to be more efficient to just die over and over again when the game lags, on purpose, to get to use the money that starts stockpiling. Maybe there could be a different way to implement it that lets the player get multiple upgrades at once, or maybe the money needs balancing? I don't know but I did get frustrated that I had all this money and couldn't spend it at once.
Either way, I loved the graphics and sound and they meshed perfectly with each other, even though they are relatively simple. The aliens had some really cool sprites, too.