Bought this game + DLC for under $3.00 back in 2012 during a sale.
This is a very unique puzzle game. Some puzzles can be tough and/or time consuming.
You build "systems" to construct molecules. You do not need a background in chemistry to understand this game. It has the atomic arrangements shown to you. These systems may or may not be automated by your design choice (later levels you can incorporate switchs in your system if you need to send certain molecules elsewhere i.e. Left thruster, or right thruster to move/dodge in a boss fight.. yes BOSS FIGHTS). Did I mention there are boss levels? No, they are not fast paced or epic, but is appropriate for this game IMO.
Some unique design capabilities include bonding, fusion, and teleporting.
MUST HAVE PATIENCE,
There is a leaderboard on efficiency of different categories such as least cycles (time unit), least symbols used, least reactors used and any I might have forgotten.
To obtain 100% of the achievements, I played this game on and off for TWO YEARS. Some steam achievements are pretty intimidating and may stress you out and make you feel hopeless and not know where to even begin :D
However, I enjoyed this game and even purchased a copy for a friend so I would recommend it to puzzle lovers.
My advice is to play this game in moderation unless you are a masochist lol.
Spent $3.00 for game + dlc (extra puzzles)
It is a systems design game where you construct things. Chemistry themed. No background needed.
There are BOSS FIGHTS >.>
Some puzzles are tough and some Steam achievements are very intimidating. MUST have patience for this game.
There is a leaderboard for each puzzle with different categories of efficiency (least cycles, least symbols used, etc).
I played on and off for TWO YEARS to obtain all the achivements.
Rating 8/10 (+2 Price, +2 Uniqueness, +2 Open Design Solutions, +1 One of the few games that forced me to take a break from occasionally, +1 A LOT of optional puzzles to keep you busy after you completed the main campaign)