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My brother has a game in this, so I figured I'd write a review.
There are some glitches with the menu return buttons etc. that I am sure you are already aware of, so I'll ignore those and get right to the actual gameplay.
Saving The Moon
+cool idea for the health bar with the colour inversion on the screen
-would have been better on a 'space' background
-gameplay not too challenging or exciting
Pee
+very funny concept
-too difficult at beginning; start sparks slowly, then get faster
-getting shocked animation should be wilder to suit the humorous game concept
Angry Faic Toss
+nice graphics
-very hard to control
-distances for medals are insane
Clones Ambush
+nice graphics
-difficulty should start lower then progress higher
-add sound effects for zapping
Sharkbait
+inverted controls make ya think
-conflicting graphics ie bitmap fish/bubbles, rendered oil barrel, vector sharks
-difficulty should increase over time
Rock Guitar
+nice graphics
-uncomfortable gameplay (controls)
-'keys' didn't match song
ASCII Tank Battle
+great concept, solid graphics, strong gameplay. Well done!
Death Ball
+decent idea
-repetitive: add difficulty progression (speed up balls, irregular intervals)
-add a nasty death animation :D
Lost In The Dark
+great concept
-graphics could use more detail
-a bit tedious/frustrating
Trilobitus
+nice graphics, strong gameplay
-sea bombs randomly disappeared
Anatomy
+nice graphics
-hit boxes were off
-gameplay not very thrilling
Block Swap (Blcok Swap :P)
+nice looking background/blocks
-unoriginal idea; needs a twist
Aerial Defence
+nice concept
-add progressing difficulty
-death animation on large cars could be better
Monkey Maze of Doom
+good concept
-should be more linear (less mazey) with more obstacles
-graphics could be improved (make the monkey look like a monkey :P)
Bacteria
+great graphics, nice ranking idea
-a bit confusing (you can click on any bacteria to kill them), make change in 'featured bacteria' more noticeable
-have the game display the one appropriate ranking, rather than showing them all and figuring it out yourself
Sky Pirates
+good concept
-improve graphics
-add progressive difficulty, start game faster, add various enemies
Spot the Difference
+cool background
-tab trick works :(
-needs more levels
Possible Plane
+great idea, lots of room for expansion
-more levels, less time
LED
+nice gadget idea
Click on Buttons
+made me laugh :)
Overall
+lots of potential games here, pretty impressive
-music a bit repetitive
-achievements should look prettier :P
Next time I would add a sort of 'adventure' mode, where the player goes through and plays the games in a select order to achieve a goal, along with the listed mode you have here.
Great job everyone!