It's not as bad as some of the reviews say. The game is playable. With that said, it does not play like a Contra game. It feels like a phone port of twin stick shooter; complete with the loot/grind. The graphics also feel kind of drab, to where enemies can at times hard to see until they're firing at you.
One of its biggest strengths is also its weakest, the camera. The camera is auto set, not letting you adjust it. It pans around depending on which room you're in. In some cases the effect is neat, but in most it is restrictive to where all of a sudden you have little to no visibility and enemies are hitting you from off the screen. In 2019 (the time of the game's release), this is unforgivable.
With the weapons, it appears the only one you get is the 2 that come with the character you play, with temporary boost weapons. Again, does not feel like Contra in any way and instead like an phone style loot/grind style twin shooter game.

The retail price of this game is insane and a pure waste of money; including a ridiculous season pass. If you can get this at a deep discount, then maybe it's worth it as there are worse games out there. But if you're expecting something that feels like Contra, avoid it at all costs.