Aim carefully: Take your time to aim your shot carefully. You need to hit the right targets in order to clear the level.
Use power-ups: Don't forget to use the power-ups that are available to help you clear the level. For example, the bomb power-up can help you destroy multiple targets at once.
Make combos: Try to make combos by hitting multiple targets in a row. This will give you extra points and make it easier to clear the level.
Be patient: Level 23 can be challenging, but with patience and practice, you will eventually be able to beat it.