Well, random colors are nice though, but what you need is some game balancing. Upgrading towers. maybe random abilities ore different tower types. Until then it will just be point and click. Building tons of towers doing all the same is not fun at all...^^
On linux there exists a logic game pack which has a Hashi game, too. You can play randomly crated Hashis of differend difficulties. You also are able to customize the rules (e.g. up to 4 lines connecting two nodes). Just search for "Bridges" in your package manager and enjoy.
+ killing gophers is fun
+ killing Garfield and Slimer is BIG fun
- NO mute-button (!!!)
- repeating elements (bg, enemies, BOSSES, SOUND)
- doesn't get any hard 'till lv 23
- the game has no end, has it?
basically funny but needs a workaround
-> 3/5
 "Resort Empire"){kind=icon}
 "Rainbo Defense"){kind=icon}
 "Classic Hashi Light Vol 1"){kind=icon}
 "Dodge"){kind=icon}
 "Pixelvader"){kind=icon}
 "Being One"){kind=icon}
 "Arrow Saver"){kind=icon}
 "Tower Defense v1.0"){kind=icon}
 "Pixel"){kind=tracking}
 "Sky Invasion"){kind=icon}
 "Broken Garden"){kind=icon}
 "Death By Ball"){kind=icon}
 "Murray Missile Mayhem"){kind=icon}
 "Cursor Catalog 2"){kind=icon}
 "Bunny Invasion: Easter Special"){kind=icon}
 "Ski Runner"){kind=icon}
 "Warfare: 1917"){kind=icon}
 "Magnetic Defense"){kind=icon}
 "Orbital Decay"){kind=icon}
 "Casual Gameplay Escape"){kind=icon}
true, try to set the graphics quality to low [setting->option->quality]