i like it, but lots and lots of grinding required to get those precious upgrades, and I'm not even sure the upgrades are making that much of a difference. I grind so much and progress so little.
at a certain point in this game (after a few fights), this game freezes my computer and I just have to reboot. It kept doing that a year ago when I first played it; tried it again today and it's still doing it.
It got more fun after I finally got my ship/weapons upgraded, but I felt I had to stay here too long for that to happen. The money coming in is a bit slow compared to price of upgrades. Maybe a faster start to upgrading would keep it interesting in the beginning, but a fun game in the end.
Twice now, when I've equipped a character with new armor, my old armor did not return to my invenory, it just vanished so I could not re-equip that armor or sell it. Why did it do that?
 "Keeper of the Grove 2"){kind=icon}
 "Long Way"){kind=icon}
 "Kingdom Rush Frontiers"){kind=icon}
 "Besieged 2 Infinite"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "Dangerous adventure"){kind=icon}
 "Super Duck Punch!"){kind=icon}
 "Sentry Knight"){kind=icon}
 "Keeper of the Grove"){kind=icon}
 "Pirateers"){kind=icon}
 "Badge Master"){kind=icon}
 "Cursed Treasure 2"){kind=icon}
 "Incursion 2: The Artifact"){kind=icon}
 "Doeo"){kind=icon}
 "i saw her standing there"){kind=icon}
 "bit Dungeon"){kind=icon}
 "Dragon Age: Journeys"){kind=icon}
 "Thing-Thing 4"){kind=icon}
They get scaled to your level and total time survived to give that mode a bit of difficulty.