New update just released on Steam, addressing a lot of complains from users who tried the game.

• Level design completely changed, levels became more focused and fun
• Quick save/quick load system changed to checkpoint system
• Added secondary fire mode for shotgun, and also shotgun stats has changed
• New enemies were added and some of the old ones changed or removed
• Music was added and some sound were changed

and a lot, lot more!
Thank you for your support!