Of all shooter games I've played so far, yours has a very good feeling to it. Besides being very simple (Squared background, little area to scroll around, green and black colours with exception to bullets and some enemies), its fast pace and movement enables the player to actually enjoy its full potential with no lag or game breaks, bugs etc. Also the "bullet-time" special was very good, well implemented and it made me feel like I was in a Matrix movie or something, hihi. Very good bullet dodge, the hitbox was just perfect. Overall a very good game, my only suggestion is that you should improve the upgrade a little bit, the time it stays up isn't very easy to catch, nor did I find any major differences (apart from the shield one which was very useful).