This should be labeled a DEMO. The game cuts off halfway through. In addition the bugs are ANNOYING. The upgrades for more starting money, lower cost bricks etc. DON'T WORK.
Needs a save component. Limiting saves to a specific site is lame otherwise I would have given it a 5 instead of a 4 of 5. Game is excellent. For people having difficulty, slow it down to slow and upgrade your solar panel once then build as many miners as you can covering different asteroids. On the later levels extend your base out in one direction and try and mine down one edge of the asteroid field as quickly as possible so you can recycle those pieces and have a smaller base to defend.
Also, start with pulsers and once you see the O-ring wave start building missile launchers because mother ships come 2 waves later and upgraded launchers are the best thing I've found for motherships. I didn't like THEL's at all. pulsers and missiles all the way.
Simple strat for every level. upgrade mana to upgrade tower, focus on mana and tower until you are losing ground to enemy then upgrade barracks to get paladins. buy a paladin and return to mana/tower. get mana to full (9999) then upgrade everything else. use paladins to beat back the enemy with tower. once everything is upgraded load up on cannons and paladins and toss in little units as backup. save your powerups for when you dish out a bunch of damage to the castle as the enemy will summon a titan. Use powerups to kill titan. Probably will have to use super arrow stream to do it so wait until titan is in range of tower to use that one. then do cannons and paladins again with b/u.
The game is not terribly difficult. Auto-fire and the ability to see how much mana you need for an upgrade would be nice
 "Vacation Mogul"){kind=icon}
 "The Space Game"){kind=icon}
 "Chain of Fire"){kind=icon}
 "Epic War 2"){kind=icon}