GemCraft Tower Defence

Similar to Desktop Tower Defence this game is based around defending against waves of enemy minions. In this game every tower can be made into a weapon by placing a gem on top of it. The various colours of gems have different powers, and you can combine them to make gems with mixed colours. The gems also have different strengths depending on the shape - by saving up you can purchase more powerful gems.
There are lots of levels, and the aim is to complete them all above a certain level, which I estimate would take days. Luckily you can save your progress and come back to it later.

Grow Nano 3

More weirdness in the latest game in the grow series. This time the aim is to help the little man get back to full health. It's not amazing, but if you haven't already seen them I recommend trying some of the other games on the site!
Tontie
Grow Cube
Grow Island

Box Heroes Teleporter

Box Heroes Teleporter is a very simple game where the aim is to roll the coloured boxes around to their respective goals.
The game is made considerably harder by the presence of teleporter blocks which transport a block from the "in" end of one, to the "out" end of the other. These transporter blocks can be moved around themselves, and a lot of the levels involve using the teleporter blocks to stack towers of blocks.
Click on a block to select it, and then use the left and right arrows to roll a block. I've solved the first fourteen levels, so leave a comment if you want a walkthrough one of these.

Unique

Simply click on the odd circle out. Fifty levels of odd-one-out fun. As the levels go on the puzzles get harder and harder, and I think I fluked the 50th level!

See if you can beat my score of 159680.
 

Chore Wars

The most amazing idea for getting housework done more frequently. Each house member creates a character and each time they complete a household chore they gain experience points!
The person who sets up the list can set up a list of "adventures", each with a corresponding number of points for completing it (it should be roughly one point for thirty minutes of work). The person with the most points each month should ideally be rewarded in some way, but that can be agreed upon by the household.

If only we'd found this at the start of the year!

Chronotron

A very clever game where the aim is to collect the "Skip" button, and then get to the exit. The twist - every time you go to the exit without the "Skip" button, you are transported back in time to the beginning of the level. However each time you restart the level your former self is there, doing whatever you just did.

Some of the levels are fast, reaction or timing based, while others are very clever puzzles that require you to plan what you will be doing minutes in the future, whilst remembering what you did minutes in the past. Certainly one of my favourite games, and maybe my favourite game concept ever!