Thanks for trying the game I really appreciate you taking the time. I've only just started learning game development so I struggled a little with how to go about doing certain things. In answer to your question about shooting through walls, yes that was deliberate. I was intending on the walls having a destruction level so you wouldn't be able to hide behind them forever but ran out of time.
I have a list of features and levels I would like to add. I might even try and make a mobile friendly version. Firstly though I think I need to go back clean up my code with comments so I can easily develop the game further as I got a bit lazy towards the end just trying to get it done in time.
Thanks again for your feedback.