Just a small complaint: If you accidentally skip a first-time dialogue with an NPC, you cannot read it again. Some of them are actually helpful and funny so it would be a shame to miss them.
The final boss was easier than mid-bosses (unless you got unlucky with the meteors); in fact, the whole game was easy with upgraded Selene. Ray is another "op" character with Healing Bot and Loot Expert despite his sucky ultimate. Since the balancing of characters is intricate and often impossible - even with major changes - it would be a good idea to prohibit op char (eg Selene, and maybe Ray/Josh) in certain stages to heighten the challenge. Overall a quality game with a decent plot and feel. Just the difficulty/char imbalance was an issue.
for anyone who is wondering when Tier 21 ends, the big red spinning polygon have to reach the bottom (slowly) and eventually it will blow itself up. try to stay in the "quarter" area (between one end and middle) and just stay alive
Very enjoyable game. The music was great (although it could be longer... it loops pretty quickly!) and set the atmosphere well. I really liked the dark background when the sun is about to set, with the powerups glowing brightly. Too bad the game ends soon after that. I agree with giving each region a distinct look. I can't wait for this game to get better!