Cool! How did you survive so long? I keep dying.
For the non hardmode? I did a lot of dodging as I wanted to get Fectors (I did in the end) and prioritized getting coins and power ups to make the game less difficult. As for upgrades I went two damage upgrades (Ammo box) and two fire rate upgrades (revolver) to help with fighting enemies. I also got boots for speed to help with dodging and evading as enemies become numerous later on.
Once at hard mode I prioritized getting the damage upgrade as things start having more health and then went for fire rate. Once both upgrades are maxed a permanent upgrade called the "super-gun" becomes available which allows you to shoot in three directions in a triangular formation. This upgrade is costly as it costs 99 coins but it's worth it
As for tips currently there isn't much I can say as it is difficult to describe:
- You can shoot diagonally by pressing two keys adjacent to each other (Example pressing up and left shoots upper corner) You cannot do up + down and left + right at the same time.
- Get coins as you can. They help with upgrades
-Know which stages with upgrades. Stages 1-2, 1-4, 2-1, 2-3, 3-1 and 3-3 have upgrades available to buy. I generally buy at stages 1-2, 2-4, 3-1 and 3-3 for damage and fire rate. 2-1 and 2-3 I buy only if I have sufficient money. If not I get boots as 3-1 drops alot of coins
- Prioritize which upgrades to get. I often do damage over fire rate and speed. Boots (Speed) are least of my concern
- Value your lives. They don't drop often. Dodge as much as you can. Shoot at much enemies present as early as possible so that you don't get overwhelmed. Later stages you can get overwhelmed quite easily
- Prioritize which power-ups to keep. Best to keep are tombstone and sheriff. Sheriff makes you a bullet hell at the front. Tombstone turns you into a zombie and you can still shoot in this mode. I recommend using a screen nuke (Looks like a bomb) only if you're overwhelmed. Enemies killed by the nuke drop nothing which can hamper your progress in terms of upgrades