A couple of my ideas are as follows;
- Better interface.
Call it nit picky all you want, but the current interface is relatively bland and could definitely be improved upon(although it still gets the job done). The way that the top of the chat isn't aligned with the top of the map annoys me to no end.
Something else I'm going to tie in with this is the output. The output is a hassle to read when it fills with messages from both the game and other players. Some sort of way to easily define name from text would be great. Even if it is just bolding the name or underlining it. Image of what I'm talking about;
Also visible here is a bug I brought up here.
- Random Events
I'm not sure if you want to go in this direction but I think the game would do well with some random events thrown in. For example, you could take inspiration from Minecraft and have zombie outbreaks that spawn an excessive amount of zombies that attack populated areas. This would give those more action-drawn players something to keep them on their toes.
While I love your art style, a lot of the tiles seem to clash to an extent. It's not terrible but unless you build with design in mind, the map can become a bit of an eyesore. The trees are my biggest issue; their perspective is off and they don't stand out from the grass very well unless you're searching for them. Also, perhaps some sort of block that would allow you to build bridges to cross water?
I might add on to this later, but you have another pretty interesting game here. Keep up the great work! (: