Yes, has some issues...my bullets didn't show up for a while then some of the ships were invisible, including my own. Overall a great concept with strong production values.
It's irritating when crappy "games" steal professional icons. I launch the game eagerly and am subjected to a game the "developer" clearly has no pride in. Waste of my time. Zero stars.
If this game is over a year old then gameplay comments probably aren't read, but still: Close, but this interpretation needs just a little something new. The production values are top-notch but there's not enough new features to make it very memorable. Some things I'd like to see in a TD some day...aimable turrets, elevation bonus/penalties, towers that move.
Okay, I lost...and I don't have the interest to start over. I think what you have here is the excellent groundwork for a good strategy game...but the time limit goal isn't doing it for me.
The game is interesting but the interface needs some serious help. It looks very complex and confusing...but once you play you see that the game is very simple. (A lot of waiting.) Hot-keys are unnecessary since the game doesn't appear to be moving very quickly. What I still don't quite understand is what the threat is. I know there's a time limit, but is that it!?
Solid concept, just like before, but very easy and not very strategic. My choices were perfunctory and the limited "upgrades" didn't provide much interest in how I wanted to grow my castle.
Fun, but problems. First, simplify the terrain so it's more clear where the surface is. Second, on the 200 experience points level, clarify what experience points are, exactly. I couldn't clear it even though I'd done quite well...and couldn't figure out what I was doing wrong. Finally, in later versions I'd like a more natural feel to the bike...not so stiff. (And upgrades!)
Slick, fun, challenging (only if you want it to be), and just long enough.
Only criticism is the smaller-than-usual upgrade levels and number of buyable objects. Small potatos, really.
Great first game! Few observations...Tower Name (or type) should be above Tower Info when selected...just to help confirm. Upgrade button shouldn't be black type on blue...too hard to read (same with game complete message). Cost of upgrade should be shown in the Upgrade Info area, and I'd probably move the button right below Upgrade Info type. The towers could use names.
 "Hovernauts"){kind=icon}
 "Buttons"){kind=icon}
 "Sky Madness"){kind=icon}
 "Warzone tower defense"){kind=icon}
 "DropSum v2"){kind=icon}
 "Splitter 2"){kind=icon}
 "Gliding Thunder"){kind=icon}
 "Glass Tower"){kind=icon}
 "2012: Saving America"){kind=icon}
 "Barrelroll"){kind=icon}
 "Mystic Emporium"){kind=icon}
 "Warizard"){kind=icon}
 "Knights Beasts & Magic"){kind=icon}
 "MotoRisk"){kind=icon}
 "Ultimate Chopper!"){kind=icon}
 "Pro Rally 2"){kind=icon}
 "The Space Game: Missions"){kind=icon}
 "WMS tower defence 2"){kind=icon}
 "VK 1939"){kind=icon}