Thanks for the feedback! Glad you liked it.
The rendering issue is both that there is a hard limit on range (will always need this but could maybe increase it a bit) but also a very early version of a "visibility" system. This is indicated by the number at the bottom of the screen that shows how visible you are. It is intended to allow you to sneak around or hide from enemies such that you don't even render. It is not very obvious though so doesn't look that good right now :) Ideally it would "fade in" or "fade out" enemies so the mechanic was more obvious.
Definitely would like to do better on the AI. At the moment it is a basic "move toward capturable objective and engage enemies". Ideally they would respond to other friendlies and work together etc. maybe even responding to player instructions. Ideally they would also recognise structures like bunkers/sandbags and use them for extra cover etc.