Although this is fun, it gets repetitive so maybe racial abilities, not just "Angel, Demon, Insects". Also, I'd like "spells". It somewhat fits with the theme, and it stops drawn battles. Take a battle I had with RStudios for example. It was a random map, and there was a place where there was a bottleneck and the only way to the other side. We had dominated the whole map, so we always healed to 8. So we sat there for 30 minutes, killing each other then getting killed. Spells would change the tide of a battle, so it wouldn't draw. Anyway, for those who want to see the outcome, RStudio resigned =D.
Listen. The idea of trading resources could easily be abused with multi-accounting. Make a load of accounts, create a load of resource gathers while in newbie protection,trade all resources to main character, newbie protection runs out = recycle everything so others can't get resource, use new account. Therefore, one account could be way stronger then others at the same level.
I think the range of towers should be colour-coded so I can actually tell which towers are which - so tesla could be blue, aerial defense could be white, sniper could be red, cannon could be green and laser could be purple.
I am a good friend of GameBuilder15, and I must say, you've really developed your style. Comparing these to your most recent games, I can say that you've gotten better and better. What I love about developers is when they listen to comments, and hear people out. Take a look at ArmorGames' Corporation Inc. The save game was bugged, yet they didn't care. They ran it, grabbed the monthly/weekly prizes then ran. Yet small developers that aren't as well known are the ones who care, and I would like everyone to take a moment and acknowledge people like Gamebuilder15. Thank you for reading.
I like the idea in theory, but when you execute it, there simply isn't enough things to sustain you from level 1 to 10, which is where you say it gets better. Heck, I've played this since yesterday and I only have the motivation to get to level 5. Here are some feature suggestions: Interactive pet - toys to play with, click mouth to meow, auto moves around and just does stuff. Racing - 5 mins, 15 mins, 30 mins and 1 hour races. Exp/Gold bonus at end. Cat can multitask things? Faster idle bar - 10 seconds?
 "VortexWars"){kind=icon}
 "Backyard Monsters (removed)"){kind=icon}
 "Snailiad"){kind=icon}
 "Another Pointless Flash Button Game Derived From Other Pointless Flash Button Games Inspired For No Absolute Reason Featuring a Random Button That Asks You Random Pointless Objects and Challenges You (Yes you.) To Complete This Super Long Game If You Can"){kind=icon}
 "Wings of Majesty"){kind=icon}
 "Normandy Survival"){kind=icon}
 "Learn to Fly 2"){kind=icon}
 "Idle Chat 2"){kind=icon}
already planned, smaller hud is already being done as we speak