Chimera is an unfinished TC with the completed levels being released as an episode. It has very good level design and gameplay. Health has been increased to 125, There are new weapons and aliens with some of the aliens having new attacks. The new Octobrains appear out of puddles on the ground. You now use the spacebar to pick up the portable medkit which also contains steroids. Level 1 is a dark warehouse/factory level, leading to a ice caves level. From there you have jungle type levels and level 6 is a boss level. Level 7 appears to be an extra city level. I rate it as very good with 4 out of 5 stars.