Too many lanes enemies travel down and too few gems to try and match to hit enemies. Most of the time I'm matching gems hoping some gems will fall in the correct place so I can match gems that hit enemies. Nothing wrong with having a Demo of a game on Kong IMO.
Glitch, at the start when it says "Kill enemies to pass Barriers", I kill all of the enemies, the red barrier goes away, and nothing happens. I run to both ends of the level (as far as I can go), and nothing happens. It still says "Kill enemies to pass Barriers". I started a new game, same glitch.
Too slow, of the 7 colors, 1 do damage that turn, 1 does damage that turn if you have enough energy, 1 you need to get a lot of times before it does damage, and 1 returns a % damage if the computer attacks you next turn. The other 4 are; buff your attack next turn, buff your defense next turn, refill some energy, and refill some health. Make the game faster by most of these doing a little damage to the enemy when you get them.