Port of the DOS game Tyrian - classical arcade-style vertical scrolling shooter.
4 full episodes, ship upgrades, storyline, powerful enemies, lot of action, without ads or in-app purchases.
Sources at developer site.
This version can let you change the controls back like you had the classical way.
For those who complained this is how you can do it:
Under the Tyrian Game go to Options-> Keyboard there you can get the classical control scheme layout.
Further options for that are available in the option just before Opentyrian boots up.